2022
DOI: 10.1617/s11527-022-02080-x
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A long-term study on structural changes in calcium aluminate silicate hydrates

Abstract: Production of blended cements in which Portland cement is combined with supplementary cementitious materials (SCM) is an effective strategy for reducing the CO2 emissions during cement manufacturing and achieving sustainable concrete production. However, the high Al2O3 and SiO2 contents of SCM change the chemical composition of the main hydration product, calcium aluminate silicate hydrate (C–A–S–H). Herein, spectroscopic and structural data for C–A–S–H gels are reported in a large range of equilibration times… Show more

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Cited by 6 publications
(3 citation statements)
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“…Based on literature findings, the first decomposition process corresponds to the release of physisorbed and interlayer water molecules, whereas the second and third are attributable to the water forming from Ca 2+ and Al 3+ -bound OH − -ions, respectively [49,[82][83][84][85]. However, XRD patterns show the presence of AH 3 in our samples, which dehydrates also in the temperature range of 250-300 • C [21,46,85]. All these water losses are strongly supported by the peaks appearing at m/z = 18 in the mass spectra (insets in Fig.…”
Section: Identification Of the Ldh Phase Forming In Alkaline Mediumsupporting
confidence: 58%
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“…Based on literature findings, the first decomposition process corresponds to the release of physisorbed and interlayer water molecules, whereas the second and third are attributable to the water forming from Ca 2+ and Al 3+ -bound OH − -ions, respectively [49,[82][83][84][85]. However, XRD patterns show the presence of AH 3 in our samples, which dehydrates also in the temperature range of 250-300 • C [21,46,85]. All these water losses are strongly supported by the peaks appearing at m/z = 18 in the mass spectra (insets in Fig.…”
Section: Identification Of the Ldh Phase Forming In Alkaline Mediumsupporting
confidence: 58%
“…The DTG curves exhibit three endothermic transformations: the release of the physisorbed water or the dehydration of minor LDH/AFm phases [47,59] up to 150 • C, and that of the structural hydroxide groups up to 1000 • C, with the minimum being around 320 • C in the case of cement C 3 AH 6 and 335 • C for Bayer C 3 AH 6 . Indeed, a loss at ~300 • C has been previously assigned to the dehydration of katoites [21,47,59].…”
Section: Characterization Of Katoitesmentioning
confidence: 99%
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